The most OP skill of Jax is his E.
Counter Strike EFFECT RADIUS: 300 COST: 50 / 60 / 70 / 80 / 90 MANA COOLDOWN: 16 / 14 / 12 / 10 / 8
Counter Strike
ACTIVE: Jax enters Evasion, a defensive stance, for up to 2 seconds, causing all basic attacks against him to miss. Jax also takes 25% reduced damage from all champion area of effect abilities. After 1 second, Jax can reactivate to end it immediately.
with some CDR, the cooldown is 4 seconds, that is, only 2 seconds off since it lasts 2 seconds.
he is 2 sec on E, 2 sec off, 2 sec on, etc.
Not only you can't aa him, but also he takes 25% reduce damage from AOE, and he stuns + damage you at the end.
So I guess in theory, to counter him, you need to 1. not be a aa reliant champion and 2. not do AOE spell, but single target spell.
Also, I guess you need to have some range + an escape in case he jump+stun you.
Which champion is spell reliant, from decent range, and got some escape? I guess
can use Q + sanguine pool if being dived.
if you're looking for a support... maybe
? he can Q, W, E, and R to tank for a while if needed
can turn him into an inoffensive rabbit
can R him, or push him away, or stop his jump
can R, or bump him, or slow him
can instant fear
I agree Jax is OP.